taojintianxia commented on issue #19613:
URL: 
https://github.com/apache/shardingsphere/issues/19613#issuecomment-1197604006

   start from MySQL. as mentioned on MySQL docker hub document, mysql image 
provided the way to define customized user like following usage :
   
   `MYSQL_USER`, `MYSQL_PASSWORD`
   These variables are optional, used in conjunction to create a new user and 
to set that user's password. This user will be granted superuser permissions 
(see above) for the database specified by the MYSQL_DATABASE variable. Both 
variables are required for a user to be created.
   
   Do note that there is no need to use this mechanism to create the root 
superuser, that user gets created by default with the password specified by the 
MYSQL_ROOT_PASSWORD variable.
   
   will replace mysql root user with test_user by this way.


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